Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
DFDV
1626
CALL
DeFi Development Corp
DFDV
$81.3M
| $4.22M | ﹤0.01% |
303,600
+264,880
| +684% | +$4.4M |
|
1627
PUT
Intellia Therapeutics
NTLA
$1.5B
| $4.22M | ﹤0.01% |
244,300
+120,400
| +97% | +$1.48M |
|
1628
Bath & Body Works
BBWI
$4.01B
| $4.22M | ﹤0.01% |
163,709
+104,954
| +179% | +$3.11M |
|
1629
PUT
Stride
LRN
$3.69B
| $4.21M | ﹤0.01% |
28,300
+7,200
| +34% | +$1.06M |
|
1630
CALL
Delek US
DK
$3.87B
| $4.2M | ﹤0.01% |
130,300
+12,000
| +10% | +$313K |
|
1631
PUT
Transocean
RIG
$5.92B
| $4.2M | ﹤0.01% |
1,347,700
+702,000
| +109% | +$2.12M |
|
1632
PUT
Nutanix
NTNX
$14.9B
| $4.2M | ﹤0.01% |
56,500
+6,800
| +14% | +$499K |
|
1633
CALL
Equinor
EQNR
$95.9B
| $4.2M | ﹤0.01% |
172,200
+59,100
| +52% | +$1.48M |
|
1634
CALL
T. Rowe Price
TROW
$25B
| $4.2M | ﹤0.01% |
40,900
-63,100
| -61% | -$6.63M |
|
1635
Core Scientific
CORZ
$7.23B
| $4.2M | ﹤0.01% |
233,870
-112,931
| -33% | -$1.66M |
|
1636
Wells Fargo
WFC
$261B
| $4.19M | ﹤0.01% |
50,022
-215,893
| -81% | -$17.5M |
|
1637
PUT
Sherwin-Williams
SHW
$78.3B
| $4.19M | ﹤0.01% |
12,100
+6,500
| +116% | +$2.29M |
|
1638
CALL
ResMed
RMD
$28.3B
| $4.19M | ﹤0.01% |
15,300
+4,300
| +39% | +$1.17M |
|
1639
CALL
Yum! Brands
YUM
$41B
| $4.18M | ﹤0.01% |
27,500
+3,200
| +13% | +$471K |
|
1640
PUT
Veeva Systems
VEEV
$30.3B
| $4.17M | ﹤0.01% |
14,000
+1,100
| +9% | +$310K |
|
1641
PUT
Ovintiv
OVV
$17.5B
| $4.16M | ﹤0.01% |
103,100
+12,600
| +14% | +$514K |
|
1642
CALL
Banco Santander
SAN
$194B
| $4.16M | ﹤0.01% |
397,000
+298,300
| +302% | +$2.78M |
|
|
1643
CALL
Sherwin-Williams
SHW
$78.3B
| $4.16M | ﹤0.01% |
12,000
+2,000
| +20% | +$705K |
|
1644
CALL
Edison International
EIX
$30.7B
| $4.15M | ﹤0.01% |
75,000
-164,000
| -69% | -$8.85M |
|
1645
PUT
Goodyear
GT
$2.07B
| $4.15M | ﹤0.01% |
554,400
+51,600
| +10% | +$485K |
|
1646
PUT
PennyMac Financial
PFSI
$4.38B
| $4.14M | ﹤0.01% |
33,400
-19,300
| -37% | -$2.09M |
|
1647
PUT
Biogen
BIIB
$29.9B
| $4.13M | ﹤0.01% |
29,500
-1,100
| -4% | -$149K |
|
1648
CALL
Pagaya Technologies
PGY
$1.32B
| $4.13M | ﹤0.01% |
139,000
-30,500
| -18% | -$985K |
|
1649
CALL
Targa Resources
TRGP
$60.4B
| $4.12M | ﹤0.01% |
24,600
+17,500
| +246% | +$2.92M |
|
1650
Rio Tinto
RIO
$148B
| $4.12M | ﹤0.01% |
62,400
-145,461
| -70% | -$8.99M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.